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Leases - Rent expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 25, 2018
Sep. 25, 2018
Sep. 24, 2019
Leases      
Rent expense $ 13,821 $ 40,735  
Term (in years)     1 year
Minimum      
Leases      
Term (in years)     10 years
Lease renewal term     1 year
Maximum      
Leases      
Term (in years)     15 years
Lease renewal term     5 years
Occupancy      
Leases      
Minimum rent 12,101 35,470  
Contingent rent 229 830  
Rent expense 12,330 36,300  
Equipment and other      
Leases      
Minimum rent $ 1,491 $ 4,435